Malicious PDF — malware analysis report

Static analysis result for SHA-256 365d3d35e66c5237…

MALICIOUS

PDF

71.6 KB Created: 2021-07-17 05:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 328b1a4f20c665a1146ed4660191fc0d SHA-1: 884974c72bcf71e5fa1164e5a375045ffb4a2b0f SHA-256: 365d3d35e66c52374e424aac09f71a61d9eba800b4233452a22c4ac7310ac783
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irastuff.com/admin/ckfinder/uploads/files/80210668886.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0ed774b8c---febirixopij.pdf
    • http://dekoblickfang.de/userfiles/file/tinudazerimute.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ab054df1---77714021069.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/cab90d9a3b74a5975c20baae841e044a/joxixolamidok.pdf
    • https://mzlpro.com/web/img/podborky/files/42763765572.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/93ce934bfc77b34a1f39919d531edb5a/betomidodatilo.pdf
    • https://sardavetri.it/userfiles/file/vatowurojizo.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/56298554835.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f348b443b5---87188242358.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2512f50d6600ccdc42334bb4d99ea779/72714156210.pdf
    • http://kirsanov-maslo.ru/uploads/94261507687.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0ff43ba29---bofazufavi.pdf
    • https://vestol.bg/files/file/51981722697.pdf
    • https://zlato-eu.sk/upload/files/76146540958.pdf
    • https://fallsplat.se/file/36758595932.pdf
    • http://weingut-suppan.at/files/5966169743.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab53701005e---59404787232.pdf
    • http://cdmatik.com/uploads/file/14707211484.pdf
    • http://gps-tw.com/CKEdit/upload/files/6357706854.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rl5t3bhfdm9git2rbqj9bbsd2m/kemanixumulenajuzuweterus.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1b0eff68---sakodutinevavofelonikelo.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c819b5311e---mozisuxetixofuxuguvarowut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=income+%26+expenditure+account+format+in+excel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9e1.bin
7c96ef6b17f216f4865e3e31a12ae9088101cbdbff15c1ecf58e7264116abe1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E1 9668 bytes
font_01_sfnt_off0000cec4.bin
046e92de1e8c6050e98b9869d038b7172384ad967c12f4be1de9c32bda6bc567
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 16432 bytes
font_02_sfnt_off0000f964.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes